Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755260AbYANJs0 (ORCPT ); Mon, 14 Jan 2008 04:48:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753904AbYANJsS (ORCPT ); Mon, 14 Jan 2008 04:48:18 -0500 Received: from main.gmane.org ([80.91.229.2]:53503 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753822AbYANJsR (ORCPT ); Mon, 14 Jan 2008 04:48:17 -0500 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Tuomo Valkonen Subject: Re: The ext3 way of journalling Date: Mon, 14 Jan 2008 09:48:00 +0000 (UTC) Message-ID: References: <18307.42821.166376.732473@stoffel.org> <871w8r6ruc.fsf@barad-dur.regala.cx> <20080110131659.GF10230@mit.edu> <20080110134111.GA6254@jolt.modeemi.cs.tut.fi> <20080112150621.GC6751@mit.edu> <20080113221301.GA18341@jolt.modeemi.cs.tut.fi> <20080113222310.GA20815@jolt.modeemi.cs.tut.fi> <20080113231150.GB23906@mit.edu> <20080114071555.GA6475@jolt.modeemi.cs.tut.fi> <1200303743.24517.6.camel@tara.firmix.at> X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: jolt.modeemi.cs.tut.fi User-Agent: slrn/0.9.8.1pl1 (Debian) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1112 Lines: 21 On 2008-01-14, Bernd Petrovitsch wrote: > Yes, that is a usual bug/problem in common distributions[0] as there is > no real guarantee that your clock is not far off. It isn't, right after boot. But while the system is on, it sometimes starts advancing very fast, 15min a day or so. To my knowledge, the time the CMOS clock is not used then, but rather the kernel tracks the time based on scheduler interrupts, with ntpd occasionally correcting. However, ntpd refuses to correct when the time has drifted too much, causing even further drift. > That the reason to activate `ntpdate` unconditionally: It sets the > current time to an (somewhat) accurate value and `ntpd` handles the > rest. Nope, as explained above. ntpdate at boot wouldn't help much, because the time is (approximately) correct after boot. It only drifts after it. -- Tuomo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/